Dis-azo dyes for color photography



Patented May 13, 1947 DIS-AZG DYES FOR COLOR PHOTOGRAPHY George J. Taylor, Rochester, N. Y., assignor t Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey No Drawing. Application December 2, 1944, Se-

rial No. 566,401. In Great Britain August 19, 1941 Claims. ((31. 95-6) This invention relates to substantive disazo dye compounds and to photographic elements comprising the same. This application is a continuation-in-part of my copending application Serial No. 454,905, filed August 15, 1942.

It is an object of my invention to provide disazo dye compounds. Another object is to provide photographic elements comprising such disazo compounds, especially photographic elements useful in color photography. Other objects will become apparent hereinafter.

The disazo dye compounds with which my invention is concerned have the following general formula:

wherein RN=N represents the residue of a member selected from the group consisting of a diazotized monocyclic aminoaryl nucleus of the benzene series and a diazotized aminonaphthalene nucleus, said member having a substituent selected from the group consisting of an acylamino group, a sulfonamido group, an alkoxyl group, a cyano group and a dialkylamino group, preferably in the ortho or para position to the 2120 (-N=N) group, R1N=N represents the residue of a diazotized member selected from the group consisting of a l-amino-2,5-dialkoxyben-- zene and a 1-amino-2-alkoxynaphthalene and R2 represents the residue of a member selected from the group consisting of a 2-acylamino-8-hydroxynaphthalene-G-sulfonic acid (including Z-benzoylamino 8 hydroxynaphthalene 6 sulfonic acid), a 2-acylamino-8-hydroxynaphthalene-3,6- disulfonic acid (including 2-benzoylamino-8-hydroxynaphthalene-3,6-disulfonic acid) and a 2- acylamino-6-hydroxynaphthalene-B-sulfonic acid (including 21 benzoylamino 6 hydroxynaphthalene-8-sulfonic acid).

In accordance with my invention, photographic elements are prepared comprising a light-sensitive emulsion layer, e. g. a gelatino silver halide emulsion layer, the light-sensitive emulsion layer containing a substantially non-diffusing disazo dye of the above general formula. Such photographic elements are particularly useful in color photography processes, such as those disclosed in Christensen U. S. Patent 1,517,049, dated November 5, 1924. This Christensen/patent describes a process for producing a dye image, in which a dyed gelatin layer containing a silver image is treated with a solution of a strong reducing agent such as sodium hydrosulfite or stannous chloride. Such color photography processes can be referred to as bleach-out processes or silver-dye-bleach processes. Still other of these color photography bleach-out processes are described in Ehrenfried U. S. Patent 2,322,001, dated June 15, 1943, and in Morris. U. S. Patent 2,326,055, dated August 3,1943.

The disazo dye, compounds employed in my photographic elements do not diffuse through set gelatin and therefore require no precipitating agent to prevent diffusion. Further, these disazo dyes possess desirable spectral absorption properties in gelatin, for three-color photography. For example, the disazo dyes containing acylamino, alkoxyl, cyano or dialkylamino groups in the first component give blue solutions in water, but in gelatin the color shifts to cyan (bluegreen). group in the first component yield magenta shades in gelatin. These disazo dye compounds can be employed not only as image dyes in photographic elements, but can also be employed under some circumstances as filter dyes.

In preparing photographic emulsion layers for bleach-out processes of color photography in accordance with my invention, these disazo dyes are advantageously incorporated in the emulsion layers in amounts of from about 2.5 grams-to 25 grams of dye per grams of gelatin. The emulsions are advantageously coated to give a dye concentration of from 0.15 to 1.5 grams of dye per square meter of emulsion surface. Photographic emulsions containing these disazo dyes as image dyes can be coated on a support in the usual manner and multi-layer color films can be prepared in the customary way. These disazo dyes can also be incorporated in gelatin layers which are not light-sensitive layers, and the gelatin layers be included in photographic elements such as those employed in color photographic processes.

The disazo dye compounds which I employ in practicing my invention can be prepared by diazotizing the monocyclic aminobenzene or aminonaphthalene nucleus defined hereinbefore, coupling the diazonium compound obtained with a 1-amino-2-alkoxynaphthalene or a 1-amino-2,5- dialkoxybenzene, diazotizing the monoazo dye thus formed and coupling the diazonium compound'obtained with a 2-acylamino-8-hydroxynaphthalene-G-sulfonic acid, a 2-acylamino-8- hydroxynaphthalene-3,6-disulfonic acid, or a 2- acylamino 6 hydroxynaphthalene 8 sulfonic acid.

As first components that can be employed in the preparation of the disazo dye compounds of the invention may be mentioned p-aminoacetan- The dyes containing a sulfonamido' ilide, m-aminoacetanilide, p-anisidine, o-anisidine, p-aminobenzonitrile, o-dimethylaminoaniline, p-dimethylaminoaniline, aminobenzonitrile, 2-amino-5-acetaminobenzenesulfonic acid, 2 acetamino aminobenzenesulfonic acid, 1- amino 4- oxalylaminobenzene, 2 oxalylamino- 1-amino-4-oxalylaminobenzene, 2 oxalylamino- S-aminobenzenesulfonic acid, 2-amino-5-oxalylaminobenzenesulfonic acid, 1-amino-4-propionylaminobenzene, 1-amino-4-butyryl aminobenzene, 1-amino-4-(N-methylN-acetyl-) aminobenzene, l-amino 4 benzoylaminobenzene, 1 amino-2- benzoylaminobenzene, N- (p-aminophenyl) -succinimide, N-(p-aminophenyl) -maleinimide 1 (4'-aminophenyl) -3-methyl-5-pyrazolone, N (p-aminophenyl) 2 pyrrolidone, 1 amino 4- methylsulfonylaminobenzene N-' (phenylsulfonyl) -p-phenylenediamine, l-amino 4 ethylsulfonyl-aminobenzene, 1 amino-4- butylsulfonylaminobenzene, N-(p-toluenesulfon- I! o 1-amino-2-ethylsulfonylaminobenzene, l-amino- 3 '-methylsulfonylamihobenzene,

(butyl, amyl, hexyl, octyl, decyl or cetyl) benzene, l-amino 4 acetaminonaphthalene, 1-amino-4- acetaminonaphthalene-6-sulfonic acid, l-amino- 4-acetaminonaphthalene-'7-sulfonic acid, l-amino 4 benzoylaminonaphthalene, 1 amino 4- benzoylaminonaphthalene-G-su1fonic acid, 1-amino 4 benzoylaminonaphthalene 7 sulfonic acid and 1 amino 2 p toluenesulfonylaminonaphthalene.

Second components that can be employed include, for example; l-amino-Z-ethoxynaphthalene, l-amino-2-ethoxynaphthalene 6 sulfonic acid, 1-amino-2-ethoxynaphthalene '7 sulfonic acid, 1-amino-2-methoxynaphthalene, l-amino- 2-propoxynaphthalene-6-sulfonic acid, l-amino- 2-butoXynaphtha1ene-7-sulfonic acid, l-amino- 2,5-dimethoxybenzene, 1-amino-2,5-diethoxybenzene, 1-amino-2,5-dipropoxybenzene, 1-amino-2- ethoxy-5-methoxybenzene and 1-amino-2,5-dibutoxybenzene.

Third; components that can be employed include, for example, 2-(4"-amino-2'-benzamidobenzamido) -8- hydroxynaphthalene 6 sulfonic acid, 2 (4'-amino-benzamido) -8-hydroxynaphthalene 6 sulfonic acid, Z-benzoylamino-B-hydroxynaphthalene-6-sulfonic acid, Z-acetamino- 8 hydroxynaphthalene-6-sulfonic acid, 2 propionylamino-8-hydroxynaphtha1ene 6 sulfonic acid, 2 (4-acetaminobenzamido) 8 hydroxynaphthalene-G-sulfom'c acid, 2- (4"-acetamino-4- benzamido-benzamido) -8- hydroxynaphthalene- 6-sulfonic acid, 2 (2 sulfo-4-aminobenzamido) -8-hydroxynaphthalene- 6 -sulfonic acid and the corresponding N-benzoyl and N-acyl derivatives of 2-amino-8-hydroxynaphthalene-3,6-disulfonic acid and Z-amino-G-hydroxynaphthalene-8-sulfonic acid. It will be understood that other N-acyl derivatives can be employed in addition to those specifically named, as only the simpler and more common 1 -acyl derivatives have been given.

It will be apparent from the illustrative first components given hereinbefore that the term acylamino group refers broadly to groups containing a linkage which are joined directly to the benzene nucleus through the nitrogen atom of the amino group. Both open chain and cyclic groups are included. Similarly the term sulfonamido group refers to groups containing a -1LISO2 linkage which are joined directly to the benzene nucleus through the nitrogen atom of the sulfonamido group.

The following examples illustrate the preparation of the disazo dye compounds of the invention:

Example 1 37.5 grams (.25 gram mole) of p-aminoacetanilide are dissolved in 1000 grams of water and 60 grams of concentrated hydrochloric acid (specific gravity 1.18). The resulting solution is cooled to 10 C. and diazotizedby adding, with stirring, 17.5 grams of sodium nitrite while maintaining th'e temperature at about 10 C. Stirring is continued for /2 hour after complete addition of the sodium nitrite at the end of which time the complete diazotization mixture is run into a suspen-. sion of 66.8 grams .25 gram mole) of l-amino- 2-ethoxynaphthalene '7 sulfonic acidin' 500 grams of water following which 50 grams of CI-IzCOONaBHzO are added and stirring is continuedfor about 24 hours. The reaction mixture is then cooled to 10 C.. and made alkaline. by the addition of 280 grams of 10% aqueous sodiumhydroxide following which it'is diazotizedwith 35.

grams of sodium nitrite and grams of concentrated hydrochloric acid (specific gravity 1.18) Throughout the diazotization reaction the reaction mixture is stirred while maintained at a temperature of about 10 C. After completion of the diazotization reaction which requires about two hours, the diazotization productis salted out with sodium chloride, recovered by filtration, and placed in sufficient water at 0.? C. to form a paste. This diazotization product is. then coupled at a temperature of 10C. with a solution of 120.grams (.25-gram mole) of 2+:(4"-amino-4f-henzamidobenzamido) -8c-hydroxynaphthalene 6' sulfonic acidin 300 grams of pyridine and grams of an aqueous 28%. ammoni ,v solution. The: reaction mixtureresulting? is :stirred: for 24 hours at :1 the end of which time the dye compound formed is is added slowly to 9.5 grams of concentrated hyrecovered by filtration. This dye compound may drochloric acid (specific gravity 1.18) in 50 grams be purified by salting it out of a water solution of water at 0. Stirring is continued for two with a salt such as sodium chloride. The dye hours at the end'of which time the diazonium reobtained has in its free acid state, the formula: 5 action mixture is run into a solution of 5.7 grams 00211 OH H H 11 o 1 o o l HO3S- dour V Example 2 ,1 of 1-amino-2ethoxynaphthalene in 100 grams of ter and 3.7grams of concentrated sulfuric acid 0.25 gram mole of p-ammoacetanihde 1s d1- a azotized and the diazonium compound obtained is (speclfic gravlty 1'84) at The reactlon mixture is stirred for about 24 hours at the end of which time it is cooled to 10 C. and made alkaline by theaddition of '78 grams of a 10% aqueous sodium hydroxide solution. Following this, the reaction mixture is diazotized with 5 grams of sodium nitrite and 33 grams of concentrated hydrochloric acid (specific gravity 1.18) The diazotization is complete in about two hours at coupled with 0.25 gram mole of l-amino-Z-ethoxynaphthalene-E-sulfonic acid and the monoazo dye thus obtained is in turn diazotized and coupled with 0.25 gram mole (90 grams) of 2-(4- amino-benzamido) 8 hydroxynaph'thalene-G- sulfonic acid. The dye compound obtained has in its free acid state the formula:

002 15 of! d which time the diazotization product is salted out E H T with sodium chloride, filtered off and placed in fi O N N fiO enough water to form a paste at 0 C. This diazo- 0 0 tization product is then coupled with asolution 803E H033 of 10.7 grams of 2-(4'-aminobenzamido)-8-hydroxynapthalene-6-sulfonic acid in 50 grams of The d1azot1zat1on, coupling and recovery operapyridine and 23 grams of 23% aqueous ammonia 1910115 necessary to the formation of the dye at 10 C. The reaction mixture is stirred for 24 pound of this example can be carried out followhours t; which t th dye is filt 1 d ing e procedure described in detail in Example purified by salting out of a water solution by the 1. The dye compound of this example is useful addition of sodium chloride. The dye thus obin the color photography process disclosed in the tained corresponds in its free acid state to the copending U. S. application of Robert A. Morris, formula:

Serial No. 446,054, filed June 6, 1942 (now U. S. Patent 2,326,055, dated August 3, 1943) Example 5 0.25 gram mole of l-amino-l-acetaminonaph- Example 3 thalene-7-sulfonic acid is diazotized and the di- 0.25 gram mole of p-aminoacetanilide is diazonium compound obtained is coupled with 0.25 azotized and the diazom'um compound obtained gram mole of 1amino-2-ethoxynaphthalene-G- is coupled with 0.25 gram mole of 1-amino-2- sulfonic acid and the monoazo dye thus obtained ethoxynaphthalene-G-sulfonic acid and the is in turn diazotized and coupled with 0.25 gram monoazo dye thus obtained is in turn diazotized mole of 2-benzoylamino-8hydroxynaphthaleneand coupled with 0.25 gram mole of 2-acetamino- 6-Su1f0nic acid. The dye compound obtained has 8-hydroxynaphthalene-6-sulfonic acid. The dye 55 in its free acid state the formula:

compound obtained has 1n its free acid form the OCZHE 0H formula: V H H 0 0,115 o H CHaKfi-N N=N N=N Nfi-C H H o B038 0 CH (JN N=N N=N NC CH n O n 3 0 H033 0 S0311 S0311 s oan' The diazotization, coupling and recovery opera- The dia zotiza tion coupling and recovery opneCeSSary the forma ion. of the dye Comerations necessary to the formation of the dye Po d of t i e ample can be earned out followcompound of this example can be carried out foling the procedure described in detail in Examlowing the procedure described in detail in Ex- D19 ample Example 6 Example 4 002E OH O 7.8 grams of 1-amino-4-oxalylaminobenzene-2- E sulfonic acid are dissolved in 50 grams of water CHKOON=N O and 24.5 grams of 10% aqueous sodium hydroxide. H038 2.1 grams of sodium nitrite dissolved in 20 parts of water are then added and the resulting solution S0311 4.9' g; of p-anisidine weredissolvedsin 5000; Example 8 of water-end. 10 cc. of-concentrated hydrochloric am on acid (Sp. G, 1.18). The resulting. solution-was fl cooled to 0- C. and 3 g. of sodiuminitrite in 1500. NOON: y N: N-C-CHa of water were-added. The resulting solution was 5 I stirred for 30 minutes and then the excess nitrile 1103swas destroyed with sulfamic acid. The resulti diazonium salt solution was then added'to' a-dis- SOa'H persion of 10.7 g. of 2-ethoxy-1-naphthylamine- 4.7 g. of p aminobenzonitrile'was dissolved in fi-sulfonic acid in 50 cc. of'water. g. of sodium 10 125 cc. of water and 10 cc. of concentrated hyacetate were added to the mixture and the whole drochloric acid. The resulting solution was was stirred for at least eight hours. The reaccooled'to C. and'3' g. of sodium nitrite in 15 cc. tion mixture was then made alkaline with 10 of water were added. The resulting mixture was percent aqueous sodium hydroxideandthen 6 g. cooled to 5 C. and stirred for one hour, whereof sodium nitrite in 30cc. of water were" added; 15 upon the excess nitrite wasdestroyed withsulf- The resulting dispersion was; addedrslowly to amic acid. The remaining procedure was exactcc. of concentrated" hydrochloric acid in; 75' cc. ly the same as in Example 6, using 10.7 g. of 2- of water, at 0 C. The whole wasstirred for 2 ethoxy-1-naphthylamine-6-sulfonic acid as the hours; The100 g. of sodiumchloride-were added second component and 112g. of N-acetyl-v-acid, and. the whole was stirred for. one hour. The 20 as the third component.

resulting diazo salt was thenfiltered off and; disg l 9 persed in 100 cc. of cold water. The resultin M0113). 002B. 011 0 dispersion was added to: a solution of'14.4 g. of l H H N- (4-amin0benzoyl) -'y.acid in 100 cc. ofpyridine -O- and 50 cc. of 28 per cent aqueous ammonia. The HO3S resultingv mixture-was stirred for 17 hours-then heated on a steam bath for 5 minutes, cooled SOHH and the disazo dye. filtered off. The disazo dye This dye Wa p e tly as in Examp 6 was purified by-saltingout from a water solution. using g. of o-dimethy as the t 3o component instead of p-anisidine. Example 7 The compounds whose formulae are given here- N=N N=N- N--C NH:

HO3S

S OzH This dye was prepared exactly as in Example 6- inafterv can be prepared following the general employing 4.9 g. of o-anisidine instead of'p-anisiprocedure described and illustrated in the foredine as the first component and 19.1 g. of N-(4"- going examples. When the first diazonium commino-l-benzamido-benzoyl)--'y-acid instead of ponent contains a sulfonic acid group, the pro- N(4'-amin0benzoy1)-'y-acid, as the third comcedure described in Example 4 is ordinarilyfolponent. The second component was the same lowed; if no sulfonic acid group is present, the. as that in Example 6,- viz. 2-ethoxy-1-naphthylgeneral procedure described in Example 1 is emamine-G-sulfonic acid. ployed.

SOaH OCHil SOaH N-(p-toluenesulfonyl)-p-phenylenediamine art for coloring these materials. When the disazo dye compounds are to be employed in color photography operations of the character indi- 20 cated hereinbefore it will be understood that the manner of their employment is the same as described in the patents and applications referred to.

It will be understood that the term benzoyl- First Component Second Component Third Component fomc ac1 2-acetamino-5ami nobenzenesulfonic acid Z-acetam:no-dammo-benzenesulfonmethyl-amide.

-(P-aminophenyD-nhth alimirin p-aminm nptqnilirln l-amino-Zgathoxynaphthalene-G-sul- 2-(4-aminobenzamido)-8-hydroxynaphthalene-6- sugonic acid.

Do. 2-acet1amino-8-hydroxynaphthalene-3,6-disnlfonic c Z-acegamino-6-hydroxynaphtha1ene-8-sulfonic l-aminoi2-eth0Xynaphthalene-7-si1lfon- 2- (4- acetaminob enzamido) 8- hydroxynapthalene-6-su1l'onic acid.

Do.-. do 2-ban;oylamino-8-hydroxynaphthalene-S-sulionic aci Do do 2-aceamino-8-hydroxynaphthalene-fi-sulfonic acl Dodo 2-(4-aminobenzamido)-8-hydroxynaphthalene- 3,6-disu1fonic acid. Do d o Z-(W-QHIiHO T-SlllfOlliC acid benzamido)-8-hydroxynaphthalene-G-sulfonic acid. 1-(4amiuophenyl)-3-methyl-5-pyrazolone l-amino2-ethoxynaphthalene-S-sul: 2- (4-aminobenzamido) -8-hydroxynaphthalene-6- fonlc acid. sulfonic acid. l-(3'-amin0phenyl)-3-1nethyl-5-pyra7o ne do 2-(4-aoetaminob enzamido)-8-hydroxynaphthalene-(isulfonic acid. l-(4-aminophenyl)-3-carboxyl-5-pyrazolone d0 2- (4-acetaminobenzamido)-8-hydroxynaphthalene-3,6-disulfonic acid. l-(4'-aminophenyl)-3-carboxylic acid ethyl ester-5- 1-amino-Z-ethoxynaphtha1ene-7-su1- 2-(4-aminobenzamido)-8-hyd.roxynaphtha1ene-6 pyrazolone. ionic acid. sulfonic acid. 1-(4-aminophenyl)-3-phenyl-5-pyraml l-. d

Z-bengoylamino-dhydroxynaphthaleneS-sulfonic aci l-amino-4-acetaminonaphthalene l-amino-2-ethoxynaphthalene-fi-sul- 2(4-aminobenzamido)-8-hydroxynaphthalene-6- fonic acid. sulfonic acid. l-amino-4-benzoylami m h ne do 2-?ropionCy1 lamino-8-hydroxynaphthalene-d-sulonic ac1 l-amino-4-acetaminonaphthalene-G-sulfonic acid. 1-amino-2,5-dimothoxybenzene 2-(4-acetaminobenzamido)-8-hydroxynaphthalene-dsulfonic acid. 1-amno 4-benzoylaminonaphthalene-6-sulfonic d0 2-acetamino-8-hydroxynaphthalenB-B,6-d1sl11fomc l-amhoA-benzoy1aminonaphthalene-7-sulfonic a l-amino-2-p-toluenesulfonylaminonaphthalene l-amino-2-etho xynaph thalene-7-sulfogic acid. 0

Z-propionylamino-6-hydroXynaphthalene-B-sulfonic acid.

It will be understood that the disazo dye compounds specifically disclosed herein are intended to be illustrative and not limitative of my invention. Thus, within the teachings of the invention, the various components disclosed herein may be combined with one another to yield the new disazo dye compounds of the invention. 7 To illustrate, p-aminoacetanilide in Example 1 can be replaced by an equivalent gram molecular weight of any of the other first components to obtain disazo dye compounds of the invention. That is, any first component can be replaced by any other first component, any second component can be replaced by any other second component and any third component can be replaced by any other third component.

When used to color wool and cotton, the disazo dye compounds of the invention can be applied to these materials by methods well known to the especially useful in practicing my invention:

wherein and X each represents a member selected from the group consisting of hydrogen,

'15 a cyano group, an alkoxyl group, a dialkylamino 11 group and an aliphatic acylamino group but X and X do not represent hydrogen at the same time, R represents an alkyl group, Y represents a member selected from the group consisting of a hydroxyl group and a sulfonic acid group but Y and Y do not both represent a hydroxyl group at the same time and Y and Y do not both represent a sulfonic acid group at the same time, and R" represents an acyl group. R is advantageously an aliphatic acyl group when X or X represents a cyano group. The alkyl groupsreferred to above are advantageously alkyl roups of from 1 to 4 carbon atoms and the alkoxyl groups are advantageously alkoxyl groups of from 1 to 4 carbon atoms. The X and X groups are advantageously acylamino groups containing from 1 to 2 carbon atoms, and when they are, the R" group is advantageously an aromatic acyl group.

I claim:

1. A gelatino silver halide emulsion layer for the bleach-out process of color photography uniformly colored with a disazo dye compound having the formula:

wherein RN=N- represents the residue of a diazotized monocyclic aminoaryl nucleus of the benzene series having a member selected from the group consisting of an acylamino group, an alkoxyl group, a cyano group, a 'dialkylamino group, and a. sulfonamido group attached to its nucleus, R1N=N represents the residue of a diazotized member selected from the group consisting of a 1-amino-2,5-dialkoxybenzene and a 1-amino-2-alkoxynaphthalene and R2 represents the residue of a member selected from the group consisting of a 2-acylamino-B-hydroxynaphthalene-fi-sulfonic acid, a Z-acylamino-S-hydroxynaphthalene-3,6-disulfonic acid and a 2-acylamino-fi-hydroxynaphthalene-8-sulfonic acid.

2. A gelatino silver halide emulsion layer for the bleach-out process of color photograph uniformly colored with a disazo dye compound having-the formula:

wherein RN=N represents the residue of a diazotized monocyclic aminoaryl nucleus of the benzene series containing a, dialkylamino group attached to its nucleus in a position selected from the ortho and para positions to the azo bond which is joined to said benzene nucleus R, R1-N:N- represents the residue of a diazotized l-amino-Z alkoxynaphthalene-6-sulfonic acid and R2 represents the residue of a 2-benzoylamino-8 hydroxynaphthalene 6 sulfonic acid.

4.,A gelatino silver halide emulsion layer for the bleach-out process of color photography uniformly colored with a disazo dye compound havingthe formula:

sents the residue of 2-acetylamino-8-hydroxynaphthalene-S-sulfonic acid.

5. A gelatino silver halide emulsion layer for the bleach-out process of color photography uniformly colored with a disazo dye compound having the formula:

wherein RN=N- represents the residue of a diazotized monocyclic aminoaryl nucleus of the benzene series containing an alkoxyl group containing from 1 to 4 carbon atoms attached to its nucleus in a position selected from the ortho and para positions to the azo bond which is joined to said benzene nucleus R, R1-N=N- represents the residue of a diazotized l-amino-Z-alkoxynaphthalene-G-sulfonic acid in which the alkoxy group contains from 1 to 4 carbon atoms and R2 represents the residue of a 2-benzoylamino-8- hydroxynaphthalene-6-sulfonic acid.

6. A gelatino silver halide emulsion layer for the bleach-out process of color photography uniformly colored with a disazo dye compound having the formula:

wherein R-N=N- represents the residue of a diazotized monocyclic aminoaryl nucleus of the benzene series containing a dialkylamino group in which each alkyl group contains from 1 to 4 carbon atoms attached to its nucleus in a position selected from the ortho and para positions to the azo bond which is joined to said benzene nucleus R, R1-N=N- represents the residue of a diazotized-l-amino 2 alkoxynaphthalene-G- sulfcnic acid in which the alkoxy group contains from 1 to 4 carbon atoms and R2 represents the residue of :a 2-benzoylamino-8-hydroxynaphthalene-G-sulfonic acid.

7. A gelatino silver halide emulsion layer for the bleach-out process of color photography uniformly colored with a disazo dye compound having the formula:

wherein RN=N- represents the residue of a diazotized monocyclic aminoaryl nucleus of the benzene series containing a cyano group attached to its nucleus in a position selected from the ortho and para positions to the azo bond which is joined to said benzene nucleus R, R1N==N represents the residue of a diazotized l-amino-Z-alkoxynaphthalene-G-sulfonic acid in which the alkoxy group contains from 1 to 4 carbon atoms and R2 represents the residue of Z-acetylamino-B-hydroxynaphthalene-6-sulf0nic acid.

8. A gelatino silver halide emulsion layer for the bleach-out process of color photography uniformly colored with the disazo dye compound represented by the following formula:

10. A gelatino silver halide emulsion layer for the bleach-out process of color photography uniformly colored with the disazo dye compound represented by the following formula:

002E; OH

GEORGE J TAYLOR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,080,041 Gaspar May 11, 1937 2,125,015 Gaspar July 26,1938 2,281,149 Gaspar Apr. 28, 1942 2,286,714 Chechak June 16, 1942 2,286,838 Seymour et a1 June 16, 1942 2,286,837 Seymour et a1. June 16, 1942 FOREIGN PATENTS Number Country Date Great Britain Nov. 30, 1938 

